HD6432646 Hitachi, HD6432646 Datasheet - Page 672

• Manufacturer Part Number: HD6432646
• Description: (HD64F264x Series) 16-Bit Microcomputer
• Manufacturer: Hitachi

Bits 3 to 0—Frame Frequency Select 3 to 0 (CKS3 to CKS0): Bits 3 to 0 select the operating
clock and the frame frequency. In subactive mode, watch mode, and subsleep mode, the system
clock (ø) is halted, and therefore display operations are not performed if one of the clocks from ø/8
to ø/1024 is selected. If LCD display is required in these modes, ø
selected as the operating clock.
Bit 3:
CKS3
0
1
Notes: *1 When 1/3 duty is selected, the frame frequency is 4/3 times the value shown.
638
*2 This is the frame frequency when ø
Bit 2:
CKS2
*
0
1
Bit 1:
CKS1
0
1
0
1
0
1
Bit 0:
CKS0
0
1
*
0
1
0
1
0
1
0
1
Operating Clock
ø
ø
ø
ø/8
ø/16
ø/32
ø/64
ø/128
ø/256
ø/512
ø/1024
SUB
SUB
SUB
/2
/4
SUB
= 32.768 kHz.
SUB
Frame Frequency
ø = 20 MHz
128 Hz
(Initial value)
64 Hz
32 Hz
4880 Hz
2440 Hz
1220 Hz
610 Hz
305 Hz
152.6 Hz
76.3 Hz
38.1 Hz
, ø
SUB
*2
*2
/2, or ø
* 2
SUB
/4 must be
*: Don’t care
*1